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Thread: adding a 7x11 expansion back to an 8x10

  1. #11

    Join Date
    May 2006
    Location
    Wondervu, Colorado
    Posts
    485

    Re: adding a 7x11 expansion back to an 8x10

    Six months later....I finally finished the 2" spacer back. With the spacer back, no vignetting on 7x11 with a 450mm or 24 inch (610mm) lens (haven't tried the 30 inch yet). Without the spacer back, no vignetting on 7x11 with 300mm and shorter lenses.

    I made the spacer back out of 2" x 1/2" balsa wood and covered it with 1/16" inch basswood. Weighs 1/2 pound.

    Two bonuses--with the spacer back I can: (1) reverse the 7x11 back to portrait orientation, and (2) I gain 2" of extra "bellows;" the latter will come in handy when using the 30" lens even with 8x10 or the 4x5 reducing back (I ran out of bellows a few months back trying to photograph petroglyphs with the 30" lens and 4x5 reducing back across a roped off area--not enough bellows to focus the 30" lens at 20'.).
    Attached Thumbnails Attached Thumbnails DSCF5430.JPG   DSCF5432.JPG   DSCF5433.JPG   DSCF5429.JPG  

  2. #12

    Join Date
    May 2006
    Location
    Wondervu, Colorado
    Posts
    485

    Re: adding a 7x11 expansion back to an 8x10

    2" spacer back under construction...I used 1/2" x 1/8" and 1/4" x 1/8" basswood strips for the rabbets/lighttraps...
    Attached Thumbnails Attached Thumbnails 2010_0523Image0047.JPG   2010_0523Image0048.JPG   2010_0523Image0049.JPG   2010_0523Image0050.JPG  

  3. #13

    Join Date
    May 2006
    Location
    Wondervu, Colorado
    Posts
    485

    Re: adding a 7x11 expansion back to an 8x10

    finish...came out a little darker than the camera, but what the heck, it's an after-market add-on accessory....
    Attached Thumbnails Attached Thumbnails 2010_0523Image0056.JPG   2010_0523Image0057.JPG   2010_0523Image0062.JPG  

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